喷流噪声声源识别与声源机理分析方法进展

喷流噪声是航空气动噪声的主要来源,会造成严重的环境污染和健康威胁。缺乏对湍流涡如何产生 噪声辐射这一物理过程的深刻理解,是难以设计出高精度噪声预测方法和高效降噪装置的根本原因。本文总结公开发表文献中喷流噪声的声源识别与声源机理分析的研究进展和局限。从噪声由湍流脉动产生这一因果 律出发,指出未来研究仍需要对噪声和湍流脉动建立合理的物理模型和控制方程,进行合理的分离,并将噪声 脉动表示为背景湍流的广义函数,从动力学角度揭示非定常湍流涡演化产生噪声辐射的物理机理。

Progress and prospective of the identification of noise sources and analysis of noise source mechanisms in jets

Jet noise is the dominating component of aircraft noise, and causes severe environmental pollution and health threats. Yet lack of a fundamental understanding of how turbulent eddies generate noise radiation poses great challenges in designing accurate noise prediction methodologies and efficient noise reduction devices. This paper reviews the progresses and limitations of the studies on the turbulent noise source identification and noise source mechanisms in open literature. Judging by the cause-effect reasoning that the turbulent fluctuations generate acoustic perturbations, it seems promising to develop physically more accurate models and governing equations to separate the acoustic and turbulent fluctuations in future research. By explicitly formulating the former as the generalized function of the latter, the dynamic process how turbulent eddies generate noise radiations may be revealed.